Pathloss reference signal identification

ABSTRACT

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify one or more pathloss reference signals based at least in part on whether a configuration, that indicates a set of pathloss reference signals, has been received and based at least in part on whether a pathloss reference signal activation command has been received; and estimate pathloss using the one or more pathloss reference signals. Numerous other aspects are provided.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims priority to U.S. Provisional PatentApplication No. 62/980,847, filed on Feb. 24, 2020, entitled “PATHLOSSREFERENCE SIGNAL IDENTIFICATION,” and assigned to the assignee hereof.This patent application also claims priority to U.S. Provisional PatentApplication No. 62/982,707, filed on Feb. 27, 2020, entitled “PATHLOSSREFERENCE SIGNAL IDENTIFICATION,” and assigned to the assignee hereof.The disclosures of the prior applications are considered part of and areincorporated by reference into this patent application.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wirelesscommunication and to techniques and apparatuses for pathloss referencesignal identification.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, and/or the like). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency-division multipleaccess (FDMA) systems, orthogonal frequency-division multiple access(OFDMA) systems, single-carrier frequency-division multiple access(SC-FDMA) systems, time division synchronous code division multipleaccess (TD-SCDMA) systems, and Long Term Evolution (LTE).LTE/LTE-Advanced is a set of enhancements to the Universal MobileTelecommunications System (UMTS) mobile standard promulgated by theThird Generation Partnership Project (3GPP).

A wireless communication network may include a number of base stations(BSs) that can support communication for a number of user equipment(UEs). A UE may communicate with a BS via the downlink and uplink. Thedownlink (or forward link) refers to the communication link from the BSto the UE, and the uplink (or reverse link) refers to the communicationlink from the UE to the BS. As will be described in more detail herein,a BS may be referred to as a Node B, a gNB, an access point (AP), aradio head, a transmit receive point (TRP), a New Radio (NR) BS, a 5GNode B, and/or the like.

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent user equipment to communicate on a municipal, national,regional, and even global level. NR, which may also be referred to as5G, is a set of enhancements to the LTE mobile standard promulgated bythe 3GPP. NR is designed to better support mobile broadband Internetaccess by improving spectral efficiency, lowering costs, improvingservices, making use of new spectrum, and better integrating with otheropen standards using orthogonal frequency division multiplexing (OFDM)with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDMand/or SC-FDM (e.g., also known as discrete Fourier transform spreadOFDM (DFT-s-OFDM)) on the uplink (UL), as well as supportingbeamforming, multiple-input multiple-output (MIMO) antenna technology,and carrier aggregation. However, as the demand for mobile broadbandaccess continues to increase, there exists a need for furtherimprovements in LTE and NR technologies. Preferably, these improvementsshould be applicable to other multiple access technologies and thetelecommunication standards that employ these technologies.

SUMMARY

In some aspects, a method of wireless communication, performed by a userequipment (UE), may include identifying one or more pathloss referencesignals based at least in part on whether a configuration, thatindicates a set of pathloss reference signals, has been received andbased at least in part on whether a pathloss reference signal activationcommand has been received; and estimating pathloss using the one or morepathloss reference signals.

In some aspects, a method of wireless communication, performed by a UE,may include identifying one or more pathloss reference signals based atleast in part on a configuration that indicates a set of pathlossreference signals, wherein a number of pathloss reference signals,included in the set of pathloss reference signals, is based at least inpart on whether pathloss reference signal activation commands areenabled or disabled; and estimating pathloss using the one or morepathloss reference signals.

In some aspects, a UE for wireless communication may include a memoryand one or more processors operatively coupled to the memory. The memoryand the one or more processors may be configured to identify one or morepathloss reference signals based at least in part on whether aconfiguration, that indicates a set of pathloss reference signals, hasbeen received and based at least in part on whether a pathloss referencesignal activation command has been received; and estimate pathloss usingthe one or more pathloss reference signals.

In some aspects, a UE for wireless communication may include a memoryand one or more processors operatively coupled to the memory. The memoryand the one or more processors may be configured to identify one or morepathloss reference signals based at least in part on a configurationthat indicates a set of pathloss reference signals, wherein a number ofpathloss reference signals, included in the set of pathloss referencesignals, is based at least in part on whether pathloss reference signalactivation commands are enabled or disabled; and estimate pathloss usingthe one or more pathloss reference signals.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a UE, may causethe one or more processors to identify one or more pathloss referencesignals based at least in part on whether a configuration, thatindicates a set of pathloss reference signals, has been received andbased at least in part on whether a pathloss reference signal activationcommand has been received; and estimate pathloss using the one or morepathloss reference signals.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a UE, may causethe one or more processors to identify one or more pathloss referencesignals based at least in part on a configuration that indicates a setof pathloss reference signals, wherein a number of pathloss referencesignals, included in the set of pathloss reference signals, is based atleast in part on whether pathloss reference signal activation commandsare enabled or disabled; and estimate pathloss using the one or morepathloss reference signals.

In some aspects, an apparatus for wireless communication may includemeans for identifying one or more pathloss reference signals based atleast in part on whether a configuration, that indicates a set ofpathloss reference signals, has been received and based at least in parton whether a pathloss reference signal activation command has beenreceived; and means for estimating pathloss using the one or morepathloss reference signals.

In some aspects, an apparatus for wireless communication may includemeans for identifying one or more pathloss reference signals based atleast in part on a configuration that indicates a set of pathlossreference signals, wherein a number of pathloss reference signals,included in the set of pathloss reference signals, is based at least inpart on whether pathloss reference signal activation commands areenabled or disabled; and means for estimating pathloss using the one ormore pathloss reference signals.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, wireless communication device, and/or processing system assubstantially described herein with reference to and as illustrated bythe drawings and specification.

The foregoing has outlined rather broadly the features and technicaladvantages of examples according to the disclosure in order that thedetailed description that follows may be better understood. Additionalfeatures and advantages will be described hereinafter. The conceptionand specific examples disclosed may be readily utilized as a basis formodifying or designing other structures for carrying out the samepurposes of the present disclosure. Such equivalent constructions do notdepart from the scope of the appended claims. Characteristics of theconcepts disclosed herein, both their organization and method ofoperation, together with associated advantages will be better understoodfrom the following description when considered in connection with theaccompanying figures. Each of the figures is provided for the purposesof illustration and description, and not as a definition of the limitsof the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can beunderstood in detail, a more particular description, briefly summarizedabove, may be had by reference to aspects, some of which are illustratedin the appended drawings. It is to be noted, however, that the appendeddrawings illustrate only certain typical aspects of this disclosure andare therefore not to be considered limiting of its scope, for thedescription may admit to other equally effective aspects. The samereference numbers in different drawings may identify the same or similarelements.

FIG. 1 is a block diagram illustrating an example of a wirelesscommunication network, in accordance with various aspects of the presentdisclosure.

FIG. 2 is a block diagram illustrating an example of a base station incommunication with a UE in a wireless communication network, inaccordance with various aspects of the present disclosure.

FIG. 3 is a diagram illustrating an example process performed, forexample, by a user equipment, in accordance with various aspects of thepresent disclosure.

FIG. 4 is a diagram illustrating another example process performed, forexample, by a user equipment, in accordance with various aspects of thepresent disclosure.

FIG. 5 is a data flow diagram illustrating an example of a data flowbetween different components in an example apparatus, in accordance withvarious aspects of the present disclosure.

FIG. 6 is a diagram illustrating an example of a hardware implementationfor an apparatus employing a processing system, in accordance withvarious aspects of the present disclosure.

DETAILED DESCRIPTION

Various aspects of the disclosure are described more fully hereinafterwith reference to the accompanying drawings. This disclosure may,however, be embodied in many different forms and should not be construedas limited to any specific structure or function presented throughoutthis disclosure. Rather, these aspects are provided so that thisdisclosure will be thorough and complete, and will fully convey thescope of the disclosure to those skilled in the art. Based on theteachings herein one skilled in the art should appreciate that the scopeof the disclosure is intended to cover any aspect of the disclosuredisclosed herein, whether implemented independently of or combined withany other aspect of the disclosure. For example, an apparatus may beimplemented or a method may be practiced using any number of the aspectsset forth herein. In addition, the scope of the disclosure is intendedto cover such an apparatus or method which is practiced using otherstructure, functionality, or structure and functionality in addition toor other than the various aspects of the disclosure set forth herein. Itshould be understood that any aspect of the disclosure disclosed hereinmay be embodied by one or more elements of a claim.

Several aspects of telecommunication systems will now be presented withreference to various apparatuses and techniques. These apparatuses andtechniques will be described in the following detailed description andillustrated in the accompanying drawings by various blocks, modules,components, circuits, steps, processes, algorithms, and/or the like(collectively referred to as “elements”). These elements may beimplemented using hardware, software, or combinations thereof. Whethersuch elements are implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem.

It should be noted that while aspects may be described herein usingterminology commonly associated with 3G and/or 4G wireless technologies,aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

FIG. 1 is a diagram illustrating a wireless network 100 in which aspectsof the present disclosure may be practiced. The wireless network 100 maybe an LTE network or some other wireless network, such as a 5G or NRnetwork. The wireless network 100 may include a number of BSs 110 (shownas BS 110 a, BS 110 b, BS 110 c, and BS 110 d) and other networkentities. A BS is an entity that communicates with user equipment (UEs)and may also be referred to as a base station, a NR BS, a Node B, a gNB,a 5G node B (NB), an access point, a transmit receive point (TRP),and/or the like. Each BS may provide communication coverage for aparticular geographic area. In 3GPP, the term “cell” can refer to acoverage area of a BS and/or a BS subsystem serving this coverage area,depending on the context in which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or another type of cell. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having association with the femto cell (e.g.,UEs in a closed subscriber group (CSG)). A BS for a macro cell may bereferred to as a macro BS. A BS for a pico cell may be referred to as apico BS. A BS for a femto cell may be referred to as a femto BS or ahome BS. In the example shown in FIG. 1, a BS 110 a may be a macro BSfor a macro cell 102 a, a BS 110 b may be a pico BS for a pico cell 102b, and a BS 110 c may be a femto BS for a femto cell 102 c. A BS maysupport one or multiple (e.g., three) cells. The terms “eNB”, “basestation”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” maybe used interchangeably herein.

In some aspects, a cell may not necessarily be stationary, and thegeographic area of the cell may move according to the location of amobile BS. In some aspects, the BSs may be interconnected to one anotherand/or to one or more other BSs or network nodes (not shown) in thewireless network 100 through various types of backhaul interfaces suchas a direct physical connection, a virtual network, and/or the likeusing any suitable transport network.

Wireless network 100 may also include relay stations. A relay station isan entity that can receive a transmission of data from an upstreamstation (e.g., a BS or a UE) and send a transmission of the data to adownstream station (e.g., a UE or a BS). A relay station may also be aUE that can relay transmissions for other UEs. In the example shown inFIG. 1, a relay station 110 d may communicate with macro BS 110 a and aUE 120 d in order to facilitate communication between BS 110 a and UE120 d. A relay station may also be referred to as a relay BS, a relaybase station, a relay, and/or the like.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/orthe like. These different types of BSs may have different transmit powerlevels, different coverage areas, and different impacts on interferencein wireless network 100. For example, macro BSs may have a high transmitpower level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relayBSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

A network controller 130 may couple to a set of BSs and may providecoordination and control for these BSs. Network controller 130 maycommunicate with the BSs via a backhaul. The BSs may also communicatewith one another, directly or indirectly, via a wireless or wirelinebackhaul.

UEs 120 (e.g., 120 a, 120 b, 120 c) may be dispersed throughout wirelessnetwork 100, and each UE may be stationary or mobile. A UE may also bereferred to as an access terminal, a terminal, a mobile station, asubscriber unit, a station, and/or the like. A UE may be a cellularphone (e.g., a smart phone), a personal digital assistant (PDA), awireless modem, a wireless communication device, a handheld device, alaptop computer, a cordless phone, a wireless local loop (WLL) station,a tablet, a camera, a gaming device, a netbook, a smartbook, anultrabook, a medical device or equipment, biometric sensors/devices,wearable devices (smart watches, smart clothing, smart glasses, smartwrist bands, smart jewelry (e.g., smart ring, smart bracelet)), anentertainment device (e.g., a music or video device, or a satelliteradio), a vehicular component or sensor, smart meters/sensors,industrial manufacturing equipment, a global positioning system device,or any other suitable device that is configured to communicate via awireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolvedor enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEsinclude, for example, robots, drones, remote devices, sensors, meters,monitors, location tags, and/or the like, that may communicate with abase station, another device (e.g., remote device), or some otherentity. A wireless node may provide, for example, connectivity for or toa network (e.g., a wide area network such as Internet or a cellularnetwork) via a wired or wireless communication link. Some UEs may beconsidered Internet-of-Things (IoT) devices, and/or may be implementedas NB-IoT (narrowband internet of things) devices. Some UEs may beconsidered a Customer Premises Equipment (CPE). UE 120 may be includedinside a housing that houses components of UE 120, such as processorcomponents, memory components, and/or the like.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular radioaccess technology (RAT) and may operate on one or more frequencies. ARAT may also be referred to as a radio technology, an air interface,and/or the like. A frequency may also be referred to as a carrier, afrequency channel, and/or the like. Each frequency may support a singleRAT in a given geographic area in order to avoid interference betweenwireless networks of different RATs. In some cases, NR or 5G RATnetworks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120 a and UE 120e) may communicate directly using one or more sidelink channels (e.g.,without using a base station 110 as an intermediary to communicate withone another). For example, the UEs 120 may communicate usingpeer-to-peer (P2P) communications, device-to-device (D2D)communications, a vehicle-to-everything (V2X) protocol (e.g., which mayinclude a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure(V2I) protocol, and/or the like), a mesh network, and/or the like. Inthis case, the UE 120 may perform scheduling operations, resourceselection operations, and/or other operations described elsewhere hereinas being performed by the base station 110.

As indicated above, FIG. 1 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 1.

FIG. 2 shows a block diagram of a design 200 of base station 110 and UE120, which may be one of the base stations and one of the UEs in FIG. 1.Base station 110 may be equipped with T antennas 234 a through 234 t,and UE 120 may be equipped with R antennas 252 a through 252 r, where ingeneral T≥1 and R≥1.

At base station 110, a transmit processor 220 may receive data from adata source 212 for one or more UEs, select one or more modulation andcoding schemes (MCS) for each UE based at least in part on channelquality indicators (CQIs) received from the UE, process (e.g., encodeand modulate) the data for each UE based at least in part on the MCS(s)selected for the UE, and provide data symbols for all UEs. Transmitprocessor 220 may also process system information (e.g., for semi-staticresource partitioning information (SRPI) and/or the like) and controlinformation (e.g., CQI requests, grants, upper layer signaling, and/orthe like) and provide overhead symbols and control symbols. Transmitprocessor 220 may also generate reference symbols for reference signals(e.g., the cell-specific reference signal (CRS)) and synchronizationsignals (e.g., the primary synchronization signal (PSS) and secondarysynchronization signal (SSS)). A transmit (TX) multiple-inputmultiple-output (MIMO) processor 230 may perform spatial processing(e.g., precoding) on the data symbols, the control symbols, the overheadsymbols, and/or the reference symbols, if applicable, and may provide Toutput symbol streams to T modulators (MODs) 232 a through 232 t. Eachmodulator 232 may process a respective output symbol stream (e.g., forOFDM and/or the like) to obtain an output sample stream. Each modulator232 may further process (e.g., convert to analog, amplify, filter, andupconvert) the output sample stream to obtain a downlink signal. Tdownlink signals from modulators 232 a through 232 t may be transmittedvia T antennas 234 a through 234 t, respectively. According to variousaspects described in more detail below, the synchronization signals canbe generated with location encoding to convey additional information.

At UE 120, antennas 252 a through 252 r may receive the downlink signalsfrom base station 110 and/or other base stations and may providereceived signals to demodulators (DEMODs) 254 a through 254 r,respectively. Each demodulator 254 may condition (e.g., filter, amplify,downconvert, and digitize) a received signal to obtain input samples.Each demodulator 254 may further process the input samples (e.g., forOFDM and/or the like) to obtain received symbols. A MIMO detector 256may obtain received symbols from all R demodulators 254 a through 254 r,perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 258 may process (e.g.,demodulate and decode) the detected symbols, provide decoded data for UE120 to a data sink 260, and provide decoded control information andsystem information to a controller/processor 280. A channel processormay determine reference signal received power (RSRP), received signalstrength indicator (RSSI), reference signal received quality (RSRQ),channel quality indicator (CQI), and/or the like. In some aspects, oneor more components of UE 120 may be included in a housing.

On the uplink, at UE 120, a transmit processor 264 may receive andprocess data from a data source 262 and control information (e.g., forreports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) fromcontroller/processor 280. Transmit processor 264 may also generatereference symbols for one or more reference signals. The symbols fromtransmit processor 264 may be precoded by a TX MIMO processor 266 ifapplicable, further processed by modulators 254 a through 254 r (e.g.,for DFT-s-OFDM, CP-OFDM, and/or the like), and transmitted to basestation 110. At base station 110, the uplink signals from UE 120 andother UEs may be received by antennas 234, processed by demodulators232, detected by a MIMO detector 236 if applicable, and furtherprocessed by a receive processor 238 to obtain decoded data and controlinformation sent by UE 120. Receive processor 238 may provide thedecoded data to a data sink 239 and the decoded control information tocontroller/processor 240. Base station 110 may include communicationunit 244 and communicate to network controller 130 via communicationunit 244. Network controller 130 may include communication unit 294,controller/processor 290, and memory 292.

Controller/processor 240 of base station 110, controller/processor 280of UE 120, and/or any other component(s) of FIG. 2 may perform one ormore techniques associated with pathloss reference signalidentification, as described in more detail elsewhere herein. Forexample, controller/processor 240 of base station 110,controller/processor 280 of UE 120, and/or any other component(s) ofFIG. 2 may perform or direct operations of, for example, process 300 ofFIG. 3, process 400 of FIG. 4, and/or other processes as describedherein. Memories 242 and 282 may store data and program codes for basestation 110 and UE 120, respectively. In some aspects, memory 242 and/ormemory 282 may comprise a non-transitory computer-readable mediumstoring one or more instructions for wireless communication. Forexample, the one or more instructions, when executed by one or moreprocessors of the base station 110 and/or the UE 120, may perform ordirect operations of, for example, process 300 of FIG. 3, process 400 ofFIG. 4, and/or other processes as described herein. A scheduler 246 mayschedule UEs for data transmission on the downlink and/or uplink.

In some aspects, UE 120 may include means for identifying one or morepathloss reference signals based at least in part on whether aconfiguration, that indicates a set of pathloss reference signals, hasbeen received and based at least in part on whether a pathloss referencesignal activation command has been received; means for estimatingpathloss using the one or more pathloss reference signals; and/or thelike. Additionally, or alternatively, the UE 120 may include means foridentifying one or more pathloss reference signals based at least inpart on a configuration that indicates a set of pathloss referencesignals, wherein a number of pathloss reference signals, included in theset of pathloss reference signals, is based at least in part on whetherpathloss reference signal activation commands are enabled or disabled;means for estimating pathloss using the one or more pathloss referencesignals; and/or the like. In some aspects, such means may include one ormore components of UE 120 described in connection with FIG. 2, such ascontroller/processor 280, transmit processor 264, TX MIMO processor 266,MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor258, and/or the like.

As indicated above, FIG. 2 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 2.

In some scenarios, quasi co-location (QCL) information (e.g., a QCLproperty) and/or a QCL type may depend on or be a function of otherinformation. A QCL property may include, for example, a Doppler shift, aDoppler spread, an average delay, a delay spread, or spatial receiveparameters, among other examples. For example, one or more QCL typesindicated to a UE can be based on a higher layer parameter QCL-Type andmay take one or a combination of the following types:

QCL-TypeA: {Doppler shift, Doppler spread, average delay, delay spread},

QCL-TypeB: {Doppler shift, Doppler spread},

QCL-TypeC: {average delay, Doppler shift}, or

QCL-TypeD: {Spatial Rx parameter}.

A UE may use spatial QCL assumptions (e.g., spatial receive parametersof QCL-TypeD) to select an analog or digital receive (Rx) beam (e.g.,during a beam management procedure). For example, a synchronizationsignal block (SSB) resource indicator (SSBRI or SRI) may indicate that asame beam used for a previous reference signal should be used for asubsequent communication.

A UE may identify an initial control resource set (CORESET) (e.g.,having CORESET ID 0 or simply CORESET #0) in NR during an initialprocedure (e.g., via a field in a master information block (MIB)). AControlResourceSet information element (CORESET IE) sent via radioresource control (RRC) signaling (e.g., included in an RRC message) mayconvey information regarding a CORESET configured for a UE. The CORESETIE generally includes a CORESET identifier (ID), an indication offrequency domain resources (e.g., a number of RBs) assigned to theCORESET, contiguous time duration of the CORESET in a number of symbols,and Transmission Configuration Indicator (TCI) states.

A TCI state may indicate a directionality or a characteristic of adownlink beam, such as one or more QCL properties of the downlink beam.As noted above, a subset of the TCI states indicate QCL relationshipsbetween DL reference signals (RSs) in one reference signal (RS) set(e.g., TCI-Set) and physical downlink control channel (PDCCH)demodulation reference signal (DMRS) ports. A particular TCI state for agiven UE (e.g., for unicast PDCCH) may be conveyed to the UE by a MediumAccess Control (MAC) Control Element (MAC-CE). The particular TCI stateis generally selected from the set of TCI states conveyed by the CORESETIE, with the initial CORESET (CORESET #0) generally configured via MIB.

Search space information may also be provided via RRC signaling. Forexample, the Search Space IE is another RRC IE that defines resourceswhere the UE is to search for PDCCH candidates for a given CORESET. Eachsearch space is associated with one CORESET. The Search Space IEidentifies a search space configured for a CORESET using a search spaceID. In an aspect, the search space ID associated with CORESET #0 isSearch Space ID #0. The search space is generally configured via aphysical broadcast channel (PBCH) (e.g., in a MIB).

In many cases, it is important for a UE to know which assumptions the UEcan make on a channel corresponding to different transmissions. Forexample, the UE may need to know which reference signals the UE can useto estimate the channel in order to decode a transmitted signal orcommunication (e.g., a PDCCH communication or a physical downlink sharedchannel (PDSCH) communication). It may also be important for the UE tobe able to report relevant channel state information (CSI) to a basestation for scheduling, link adaptation, and/or beam managementpurposes. In NR, the concept of QCL and TCI states is used to conveyinformation about these assumptions.

QCL assumptions are generally defined in terms of channel properties.Per 3GPP TS 38.214, “two antenna ports are said to be quasi-co-locatedif properties of the channel over which a symbol on one antenna port isconveyed can be inferred from the channel over which a symbol on theother antenna port is conveyed.” Different reference signals may beconsidered quasi co-located (“QCLed” or “QCL′d”) if a receiver (e.g., aUE) can apply channel properties determined by detecting a firstreference signal to help detect a second reference signal. TCI statesgenerally include configurations such as QCL relationships, for example,between the DL RSs in one channel state information reference signal(CSI-RS) set and the PDSCH DMRS ports.

In some cases, a UE may be configured with up to M TCI-States.Configuration of the M TCI-States can be via higher layer signalling,while a UE may be signalled to decode a PDSCH according to a detectedPDCCH with downlink control information (DCI) indicating one of the TCIstates. Each configured TCI state may include one RS setTCI-RS-SetConfig that indicates different QCL assumptions betweencertain source and target signals.

A UE may measure one or more downlink reference signals, received from abase station, to estimate pathloss between the UE and the base station.Pathloss indicates a reduction in power density of a signal as thesignal propagates between wireless communication devices (e.g., a UE anda base station). For example, the base station may transmit a downlinkreference signal with a transmit power that is known by the UE (e.g.,due to an indication from the base station or due to a fixed transmitpower). The UE may decode the downlink reference signal and measure areceive power that represents a power level at which the downlinkreference signal is received by the UE. The UE may compare the transmitpower (e.g., a reference signal transmit power) and the receive power(e.g., RSRP) to determine the pathloss. This is one example ofestimating pathloss from a downlink reference signal, and the UE mayestimate pathloss in another manner.

In some cases, a base station may configure (e.g., using a radioresource control (RRC) message) a set of pathloss reference signals,sometimes referred to as a pathloss reference signal pool. In somecases, the base station may instruct the UE to use one or more pathlossreference signals, of the configured set of pathloss reference signals,using a command (e.g., a signal, a message, and/or the like). Forexample, the base station may activate one or more pathloss referencesignals, of the configured set of pathloss reference signals, bytransmitting a pathloss reference signal activation command to the UE.In some cases, the pathloss reference signal activation command may beincluded in a medium access control (MAC) control element (CE)(collectively, MAC-CE). Upon receiving a MAC-CE that indicates one ormore pathloss reference signals that are to be activated, the UE maymeasure those one or more activated pathloss reference signals and/ormay use those one or more activated pathloss reference signals toestimate pathloss between the UE and the base station.

In addition to the activated pathloss reference signals for measuringand/or estimating pathloss, the UE may use one or more default pathlossreference signals, if any. The default pathloss reference signals forsounding reference signals (SRSs), physical uplink control channel(PUCCH) communications, and physical uplink shared channel (PUSCH)communications scheduled by DCI format 0_0 may be enabled by acorresponding RRC flag such as: enableDefaultBeamPIForPUSCH0_0, forPUSCH scheduled by DCI format 0_0; enableDefaultBeamPIForPUCCH, fordedicated PUCCH; and/or enableDefaultBeamPIForSRS, for dedicated SRS.

If enabled, a default pathloss reference signal is QCLed (with one ofQCL types A, B, C, or D) with reference signal QCL parameters orproperties used for receiving the CORESET with the lowest ID in theactive downlink bandwidth part (BWP) of the current component carrier(CC) of the UE. If no CORESETs are configured for the UE in the activedownlink BWP, then the default pathloss reference signal is one QCL TypeA, Type B, Type C, or Type D reference signal in the TCI state activatedfor PDSCH reception in the active DL BWP of the current CC of the UE. Insome aspects, the default pathloss reference signals and the activatedpathloss reference signals may be measured and/or used for estimationwhen a MAC-CE-based pathloss reference signal activation feature hasbeen enabled (e.g., an RRC flag enablePLRSupdateForPUSCHSRS is set totrue) and the total number of configured pathloss reference signalssatisfies a threshold (e.g., is greater than four). In some aspects, allconfigured pathloss reference signals and activated pathloss referencesignals may be measured and/or used for estimation when the MAC-CE-basedpathloss reference signal activation feature has been enabled and thetotal number of configured pathloss reference signals does not satisfythe threshold (e.g., is less than or equal to four).

However, in some cases, a UE may receive a configuration that indicatesthe set of pathloss reference signals, but may fail to receive a MAC-CEthat activates one or more pathloss reference signals of the configuredset of pathloss reference signals. For example, the base station mayfail to transmit the MAC-CE, the UE may fail to receive and/orsuccessfully decode the MAC-CE, and/or the like. In these cases, theremay be ambiguity about which pathloss reference signal(s) that the UEshould use to estimate pathloss. For example, the base station mayexpect the UE to use a first pathloss reference signal (or a first setof pathloss reference signals) to estimate pathloss, but the UE may usea second pathloss reference signal (or a second set of pathlossreference signals) to estimate pathloss. This may result in improperuplink transmit power determination (e.g., selection, calculation,and/or the like) by the UE, such as when pathloss is used to determine atransmit power for the UE. Determination of an improper uplink transmitpower may result in failed uplink communications if the UE selects atransmit power that is lower than necessary, and may result in excessconsumption of UE resources (e.g., battery power) if the UE selects atransmit power that is higher than necessary. Similar issues may ariseif the UE has not received a configured set of pathloss referencesignals (e.g., due to failure of an RRC message, due to theconfiguration failing to indicate the set of pathloss reference signals,and/or the like).

Some techniques and apparatuses described herein enable a UE and a basestation to reduce ambiguity in pathloss reference signal selection. Forexample, some techniques and apparatuses described herein provide rulesfor a UE to follow in various scenarios (e.g., when a configured set ofpathloss reference signals is or is not received, when an activationcommand is or is not received, and/or the like) to select one or morepathloss reference signals. In this way, the UE may properly determinean uplink transmit power, which may improve reliability of uplinkcommunications, may reduce latency and conserve network resources due tofewer failed communications, may conserve UE battery power by reducingthe likelihood of determining an uplink transmit power that is too high,and/or the like.

Furthermore, some techniques and apparatuses described herein conserveUE resources (e.g., processing resources, memory resources, batterypower, and/or the like) by limiting a number of pathloss referencesignals that are permitted to be configured when MAC-CE-based activationof pathloss reference signals is disabled. When MAC-CE-based activationof pathloss reference signals is disabled, configuring a large number(e.g., greater than a threshold number) of pathloss reference signalsmay result in the UE always measuring that large number of pathlossreference signals because a MAC-CE cannot be used to activate ordeactivate pathloss reference signals. Thus, some techniques andapparatuses described herein conserve UE resources by setting a maximumnumber of pathloss reference signals that are permitted to be configuredwhen MAC-CE-based activation of pathloss reference signals is disabled.These techniques and apparatuses may also improve flexibility in usingpathloss reference signals by allowing more than the maximum number ofpathloss reference signals to be configured when MAC-CE-based activationof pathloss reference signals is enabled.

FIG. 3 is a diagram illustrating an example process 300 performed, forexample, by a UE, in accordance with various aspects of the presentdisclosure. Example process 300 is an example where the UE (e.g., UE 120and/or the like) performs operations associated with pathloss referencesignal identification.

As shown in FIG. 3, in some aspects, process 300 may include identifyingone or more pathloss reference signals based at least in part on whethera configuration, that indicates a set of pathloss reference signals, hasbeen received and based at least in part on whether a pathloss referencesignal activation command has been received (block 310). For example,the UE (e.g., using receive processor 258, transmit processor 264,controller/processor 280, memory 282, identification component 506 ofFIG. 5, and/or the like) may identify one or more pathloss referencesignals based at least in part on whether a configuration, thatindicates a set of pathloss reference signals, has been received andbased at least in part on whether a pathloss reference signal activationcommand has been received.

As further shown in FIG. 3, in some aspects, process 300 may includeestimating pathloss using the one or more pathloss reference signals(block 320). For example, the UE (e.g., using receive processor 258,transmit processor 264, controller/processor 280, memory 282, estimationcomponent 508 of FIG. 5, and/or the like) may estimate pathloss usingthe one or more pathloss reference signals.

Process 300 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, the one or more pathloss reference signals areidentified based at least in part on at least one of: whether pathlossreference signal activation commands are enabled, a number of configuredpathloss reference signals, whether the number of configured pathlossreference signals satisfies a threshold, or a combination thereof.

In a second aspect, alone or in combination with the first aspect, theone or more pathloss reference signals are identified based at least inpart on a determination that pathloss reference signal activationcommands are enabled and the number of configured pathloss referencesignals satisfies a threshold. In some aspects, the UE may determinethat pathloss reference signal activation commands are enabled based atleast ine part on a determination that the configuration (e.g., an RRCmessage) includes a specific information element (IE) or bit (e.g., anenablePLRSupdateForPUSCHSRS IE or bit) that is set to a specific value.For example, a first value of the IE or bit (e.g., zero) may indicatethat pathloss reference signal activation commands are disabled, and asecond value of the IE or bit (e.g., one) may indicate that pathlossreference signal activation commands are enabled. In some aspects, thethreshold is equal to four.

In a third aspect, alone or in combination with one or more of the firstand second aspects, the one or more pathloss reference signals areidentified based at least in part on a determination that pathlossreference signal activation commands are enabled and the number ofconfigured pathloss reference signals does not satisfy a threshold. In afourth aspect, alone or in combination with one or more of the firstthrough third aspects, the one or more pathloss reference signals areidentified based at least in part on a determination that pathlossreference signal activation commands are disabled and the number ofconfigured pathloss reference signals satisfies a threshold. In a fifthaspect, alone or in combination with one or more of the first throughfourth aspects, the one or more pathloss reference signals areidentified based at least in part on a determination that pathlossreference signal activation commands are disabled and the number ofconfigured pathloss reference signals does not satisfy a threshold. Insome aspects, the threshold is equal to four. In a sixth aspect, aloneor in combination with one or more of the first through fifth aspects,the pathloss reference signal activation commands are MAC-CE commands.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the one or more pathloss reference signalsare identified based at least in part on a determination that theconfiguration has been received and based at least in part on adetermination that the pathloss reference signal activation command hasbeen received. In an eighth aspect, alone or in combination with one ormore of the first through seventh aspects, the one or more pathlossreference signals are indicated in the pathloss reference signalactivation command. In a ninth aspect, alone or in combination with oneor more of the first through eighth aspects, the one or more pathlossreference signals include the set of pathloss reference signalsindicated in the configuration or a subset of the set of pathlossreference signals indicated in the configuration. For example, if the UEreceives the configuration and the pathloss reference signal activationcommand, then the UE may use the pathloss reference signals indicated inthe pathloss reference signal activation command to estimate pathloss.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, the one or more pathloss reference signals areidentified based at least in part on a determination that theconfiguration has been received and based at least in part on adetermination that the pathloss reference signal activation command hasnot been received. In an eleventh aspect, alone or in combination withone or more of the first through tenth aspects, the one or more pathlossreference signals include a synchronization signal block used to obtaina master information block. In a twelfth aspect, alone or in combinationwith one or more of the first through eleventh aspects, the one or morepathloss reference signals include a subset of the set of pathlossreference signals. In a thirteenth aspect, alone or in combination withone or more of the first through twelfth aspects, the subset isidentified based at least in part on a rule. In a fourteenth aspect,alone or in combination with one or more of the first through thirteenthaspects, the subset includes a specific number of pathloss referencesignals (e.g., four pathloss reference signals).

In a fifteenth aspect, alone or in combination with one or more of thefirst through fourteenth aspects, the subset includes one of: a subsetof pathloss reference signals, included in the set of pathloss referencesignals, having highest reference signal identifiers among the set ofpathloss reference signals; a subset of pathloss reference signals,included in the set of pathloss reference signals, having lowestreference signal identifiers among the set of pathloss referencesignals; a subset of pathloss reference signals, included in the set ofpathloss reference signals, having highest reference signal identifiers,in a serving cell, among the set of pathloss reference signals; a subsetof pathloss reference signals, included in the set of pathloss referencesignals, having lowest reference signal identifiers, in the servingcell, among the set of pathloss reference signals; a subset of pathlossreference signals, included in the set of pathloss reference signals,having highest reference signal identifiers, in an active bandwidth partof the serving cell, among the set of pathloss reference signals; or asubset of pathloss reference signals, included in the set of pathlossreference signals, having lowest reference signal identifiers, in anactive bandwidth part of the serving cell, among the set of pathlossreference signals.

In a sixteenth aspect, alone or in combination with one or more of thefirst through fifteenth aspects, the one or more pathloss referencesignals are indicated by a base station or are specified by a wirelesscommunication standard. For example, the base station and/or thewireless communication standard may indicate that a specific CSI-RS(e.g., having a particular CSI-RS identifier, such as 10) is to be usedfor pathloss estimation if the UE has not received the configurationand/or has not received the pathloss reference signal activationcommand. In a seventeenth aspect, alone or in combination with one ormore of the first through sixteenth aspects, the one or more pathlossreference signals are not included in the set of pathloss referencesignals.

In an eighteenth aspect, alone or in combination with one or more of thefirst through seventeenth aspects, the one or more pathloss referencesignals include a subset of pathloss reference signals, of the set ofpathloss reference signals, that is indicated in the configuration. In anineteenth aspect, alone or in combination with one or more of the firstthrough eighteenth aspects, the subset of pathloss reference signalsincludes at least one of: a pathloss reference signal indicated inassociation with a physical uplink shared channel (PUSCH) power controlconfiguration (e.g., for PUSCH power control, the UE may use a pathlossreference signal indicated in an SRI-PUSCH-PowerControl IE of theconfiguration), a pathloss reference signal indicated in associationwith an activated physical uplink control channel (PUCCH) spatialrelation (e.g., for PUCCH power control, the UE may use a pathlossreference signal configured in association with a PUCCH spatial relationthat is activated by a MAC-CE), a pathloss reference signal indicated inassociation with a sounding reference signal (SRS) resource set (e.g.,for SRS power control, the UE may use a pathloss reference signalindicated in an SRS resource set for that SRS), or a combinationthereof. In a twentieth aspect, alone or in combination with one or moreof the first through nineteenth aspects, a number of pathloss referencesignals, included in the subset of pathloss reference signals, is lessthan or equal to a threshold (e.g., four).

In a twenty-first aspect, alone or in combination with one or more ofthe first through twentieth aspects, the one or more pathloss referencesignals are identified based at least in part on a determination thatthe configuration has not been received and based at least in part on adetermination that the pathloss reference signal activation command hasnot been received. In a twenty-second aspect, alone or in combinationwith one or more of the first through twenty-first aspects, the one ormore pathloss reference signals include a synchronization signal blockused to obtain a master information block. In a twenty-third aspect,alone or in combination with one or more of the first throughtwenty-second aspects, the one or more pathloss reference signals areindicated by a base station or are specified by a wireless communicationstandard. For example, the base station and/or the wirelesscommunication standard may indicate that a specific CSI-RS (e.g., havinga particular CSI-RS identifier, such as 10) is to be used for pathlossestimation if the UE has not received the configuration and/or has notreceived the pathloss reference signal activation command.

In a twenty-fourth aspect, alone or in combination with one or more ofthe first through twenty-third aspects, the one or more pathlossreference signals are identified for a particular uplink channel or aparticular uplink reference signal. For example, the one or morepathloss reference signals may be identified for a PUCCH (e.g., a PUCCHcommunication), a PUSCH (e.g., a PUSCH communication), a physical randomaccess channel (PRACH) (e.g., a PRACH communication), an SRS, and/or thelike. In a twenty-fifth aspect, alone or in combination with one or moreof the first through twenty-fourth aspects, different uplink channels(e.g., PUCCH, PUSCH, PRACH, and/or the like) or different uplinkreference signals (e.g., SRS) are associated with at least one of:different configurations that indicate corresponding sets of pathlossreference signals for a corresponding uplink channel or uplink referencesignal, different pathloss reference signal activation commands, or acombination thereof.

In a twenty-sixth aspect, alone or in combination with one or more ofthe first through twenty-fifth aspects, the configuration and thepathloss reference signal activation command are specific to an uplinkchannel (e.g., PUCCH, PUSCH, PRACH, and/or the like), an uplinkreference signal (e.g., SRS), a group of uplink channels (e.g., PUCCH,PUSCH, PRACH, and/or the like), a group of uplink reference signals(e.g., SRS in multiple SRS resource sets), or a group that includes atleast one uplink channel and at least one uplink reference signal. In atwenty-seventh aspect, alone or in combination with one or more of thefirst through twenty-sixth aspects, the one or more pathloss referencesignals are identified for all uplink channels and all uplink referencesignals.

In a twenty-eighth aspect, alone or in combination with one or more ofthe first through twenty-seventh aspects, a number of pathloss referencesignals, included in the set of pathloss reference signals, is based atleast in part on whether pathloss reference signal activation commandsare enabled or disabled. In a twenty-ninth aspect, alone or incombination with one or more of the first through twenty-eighth aspects,the number of pathloss reference signals is permitted to be greater thana threshold (e.g., four) if pathloss reference signal activationcommands are enabled, and is not permitted to be greater than thethreshold (e.g., four) if pathloss reference signal activation commandsare disabled.

In a thirtieth aspect, alone or in combination with one or more of thefirst through twenty-ninth aspects, the configuration is included in aradio resource control message. In a thirty-first aspect, alone or incombination with one or more of the first through thirtieth aspects, thepathloss reference signal activation command is a MAC-CE message. In athirty-second aspect, alone or in combination with one or more of thefirst through thirty-first aspects, the set of pathloss referencesignals includes at least one channel state information reference signal(CSI-RS).

In a thirty-first aspect, alone or in combination with one or more ofthe first through thirtieth aspects, the one or more pathloss referencesignals comprise one or more default pathloss reference signals.

Although FIG. 3 shows example blocks of process 300, in some aspects,process 300 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 3.Additionally, or alternatively, two or more of the blocks of process 300may be performed in parallel.

FIG. 4 is a diagram illustrating an example process 400 performed, forexample, by a UE, in accordance with various aspects of the presentdisclosure. Example process 400 is an example where the UE (e.g., UE 120and/or the like) performs operations associated with pathloss referencesignal identification.

As shown in FIG. 4, in some aspects, process 400 may include identifyingone or more pathloss reference signals based at least in part on aconfiguration that indicates a set of pathloss reference signals,wherein a number of pathloss reference signals, included in the set ofpathloss reference signals, is based at least in part on whetherpathloss reference signal activation commands are enabled or disabled(block 410). For example, the UE (e.g., using receive processor 258,transmit processor 264, controller/processor 280, memory 282,identification component 506 of FIG. 5, and/or the like) may identifyone or more pathloss reference signals based at least in part on aconfiguration that indicates a set of pathloss reference signals. Insome aspects, a number of pathloss reference signals, included in theset of pathloss reference signals, is based at least in part on whetherpathloss reference signal activation commands are enabled or disabled.

As further shown in FIG. 4, in some aspects, process 400 may includeestimating pathloss using the one or more pathloss reference signals(block 420). For example, the UE (e.g., using receive processor 258,transmit processor 264, controller/processor 280, memory 282, estimationcomponent 508 of FIG. 5, and/or the like) may estimate pathloss usingthe one or more pathloss reference signals.

Process 400 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, the number of pathloss reference signals is permittedto be greater than a threshold if pathloss reference signal activationcommands are enabled, and is not permitted to be greater than thethreshold if pathloss reference signal activation commands are disabled.

In a second aspect, alone or in combination with the first aspect, theone or more pathloss reference signals comprise one or more defaultpathloss reference signals.

Although FIG. 4 shows example blocks of process 400, in some aspects,process 400 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 4.Additionally, or alternatively, two or more of the blocks of process 400may be performed in parallel.

FIG. 5 is a data flow diagram 500 illustrating a data flow betweendifferent components in an example apparatus 502. The apparatus 502 maybe a UE. In some aspects, the apparatus 502 includes a receptioncomponent 504, an identification component 506, an estimation component508, and/or a transmission component 510. As shown, the apparatus 502may communicate with another apparatus 550 (e.g., a UE, a base station,or another wireless communication device) using the reception component504 and/or the transmission component 510. As shown the apparatus 502may communicate with an apparatus 550, such as a base station.

In some aspects, the identification component 506 may identify one ormore pathloss reference signals based at least in part on whether aconfiguration, that indicates a set of pathloss reference signals, hasbeen received and based at least in part on whether a pathloss referencesignal activation command has been received. In some aspects, theidentification component 506 may determine whether the configurationand/or the pathloss reference signal activation command has beenreceived based at least in part on information received from thereception component 504. In some aspects, the reception component 504may receive (or may not receive) the configuration from the apparatus550 and/or may receive (or may not receive) the pathloss referencesignal activation command from the apparatus 550. The receptioncomponent 504 may indicate, to the identification component 506, whetherthe configuration has been received and/or whether the pathlossreference signal activation command has been received. Additionally, oralternatively, the reception component 504 may provide the configurationand/or the pathloss reference signal activation command to theidentification component 506. In some aspects, the identificationcomponent 506 may identify the one or more pathloss reference signalsbased at least in part on the configuration and/or based at least inpart on the pathloss reference signal activation command.

The estimation component 508 may estimate pathloss using the one or morepathloss reference signals. For example, the identification component506 may indicate the identified one or more pathloss reference signalsto the estimation component 508. Additionally, or alternatively, thereception component 504 may provide received pathloss reference signals(e.g., from the configured set of pathloss reference signals) to theestimation component 508. The estimation component 508 may use theidentified one or more pathloss reference signals to estimate pathloss.In some aspects, the estimation component 508 may indicate the estimatedpathloss to the transmission component 510. In some aspects, thetransmission component 510 may use the estimated pathloss to communicatewith the apparatus 550, such as to determine a transmit power for acommunication to be transmitted to the apparatus 550.

The apparatus may include additional components that perform each of theblocks of the algorithm in the aforementioned process 300 of FIG. 3,process 400 of FIG. 4, and/or the like. Each block in the aforementionedprocess 300 of FIG. 3, process 400 of FIG. 4, and/or the like may beperformed by a component and the apparatus may include one or more ofthose components. The components may be one or more hardware componentsspecifically configured to carry out the stated processes/algorithm,implemented by a processor configured to perform the statedprocesses/algorithm, stored within a computer-readable medium forimplementation by a processor, or some combination thereof.

The number and arrangement of components shown in FIG. 5 are provided asan example. In practice, there may be additional components, fewercomponents, different components, or differently arranged componentsthan those shown in FIG. 5. Furthermore, two or more components shown inFIG. 5 may be implemented within a single component, or a singlecomponent shown in FIG. 5 may be implemented as multiple, distributedcomponents. Additionally, or alternatively, a set of components (e.g.,one or more components) shown in FIG. 5 may perform one or morefunctions described as being performed by another set of componentsshown in FIG. 5.

FIG. 6 is a diagram 600 illustrating an example of a hardwareimplementation for an apparatus 605 employing a processing system 610.The apparatus 605 may be a UE.

The processing system 610 may be implemented with a bus architecture,represented generally by the bus 615. The bus 615 may include any numberof interconnecting buses and bridges depending on the specificapplication of the processing system 610 and the overall designconstraints. The bus 615 links together various circuits including oneor more processors and/or hardware components, represented by theprocessor 620, the components 504, 506, 508, and/or 510, and thecomputer-readable medium/memory 625. The bus 615 may also link variousother circuits such as timing sources, peripherals, voltage regulators,and power management circuits, which are well known in the art, andtherefore will not be described any further.

The processing system 610 may be coupled to a transceiver 630. Thetransceiver 630 is coupled to one or more antennas 635. The transceiver630 provides a means for communicating with various other apparatusesover a transmission medium. The transceiver 630 receives a signal fromthe one or more antennas 635, extracts information from the receivedsignal, and provides the extracted information to the processing system610, specifically the reception component 504. In addition, thetransceiver 630 receives information from the processing system 610,specifically the transmission component 510, and based at least in parton the received information, generates a signal to be applied to the oneor more antennas 635.

The processing system 610 includes a processor 620 coupled to acomputer-readable medium/memory 625. The processor 620 is responsiblefor general processing, including the execution of software stored onthe computer-readable medium/memory 625. The software, when executed bythe processor 620, causes the processing system 610 to perform thevarious functions described herein for any particular apparatus. Thecomputer-readable medium/memory 625 may also be used for storing datathat is manipulated by the processor 620 when executing software. Theprocessing system further includes at least one of the components 504,506, 508, and/or 510. The components may be software modules running inthe processor 620, resident/stored in the computer readablemedium/memory 625, one or more hardware modules coupled to the processor620, or some combination thereof.

In some aspects, the processing system 610 may be a component of the UE120 and may include the memory 282 and/or at least one of the TX MIMOprocessor 266, the RX processor 258, and/or the controller/processor280. In some aspects, the apparatus 605 for wireless communicationincludes means for identifying one or more pathloss reference signalsbased at least in part on whether a configuration, that indicates a setof pathloss reference signals, has been received and based at least inpart on whether a pathloss reference signal activation command has beenreceived; means for estimating pathloss using the one or more pathlossreference signals; and/or the like. Additionally, or alternatively, theapparatus 605 for wireless communication may include means foridentifying one or more pathloss reference signals based at least inpart on a configuration that indicates a set of pathloss referencesignals, wherein a number of pathloss reference signals, included in theset of pathloss reference signals, is based at least in part on whetherpathloss reference signal activation commands are enabled or disabled;means for estimating pathloss using the one or more pathloss referencesignals; and/or the like. The aforementioned means may be one or more ofthe aforementioned components of the apparatus 502 and/or the processingsystem 610 of the apparatus 605 configured to perform the functionsrecited by the aforementioned means. As described elsewhere herein, theprocessing system 610 may include the TX MIMO processor 266, the RXprocessor 258, and/or the controller/processor 280. In oneconfiguration, the aforementioned means may be the TX MIMO processor266, the RX processor 258, and/or the controller/processor 280configured to perform the functions and/or operations recited herein.

FIG. 6 is provided as an example. Other examples may differ from what isdescribed in connection with FIG. 6.

The following provides an overview of some aspects of the presentdisclosure:

Aspect 1: A method of wireless communication performed by a userequipment (UE), comprising: identifying one or more pathloss referencesignals based at least in part on whether a configuration, thatindicates a set of pathloss reference signals, has been received andbased at least in part on whether a pathloss reference signal activationcommand has been received; and estimating pathloss using the one or morepathloss reference signals.

Aspect 2: The method of aspect 1, wherein the one or more pathlossreference signals are identified based at least in part on at least oneof: whether pathloss reference signal activation commands are enabled, anumber of configured pathloss reference signals, whether the number ofconfigured pathloss reference signals satisfies a threshold, or acombination thereof.

Aspect 3: The method of aspect 2, wherein the one or more pathlossreference signals are identified based at least in part on adetermination that pathloss reference signal activation commands areenabled and the number of configured pathloss reference signalssatisfies a threshold.

Aspect 4: The method of aspect 2, wherein the one or more pathlossreference signals are identified based at least in part on adetermination that pathloss reference signal activation commands areenabled and the number of configured pathloss reference signals does notsatisfy a threshold.

Aspect 5: The method of aspect 2, wherein the one or more pathlossreference signals are identified based at least in part on adetermination that pathloss reference signal activation commands aredisabled and the number of configured pathloss reference signalssatisfies a threshold.

Aspect 6: The method of aspect 2, wherein the one or more pathlossreference signals are identified based at least in part on adetermination that pathloss reference signal activation commands aredisabled and the number of configured pathloss reference signals doesnot satisfy a threshold.

Aspect 7: The method of any one of aspects 2-6, wherein the pathlossreference signal activation commands are medium access control (MAC)control element (CE) commands.

Aspect 8: The method of any one of the preceding aspects, wherein theone or more pathloss reference signals are identified based at least inpart on a determination that the configuration has been received andbased at least in part on a determination that the pathloss referencesignal activation command has been received.

Aspect 9: The method of aspect 8, wherein the one or more pathlossreference signals are indicated in the pathloss reference signalactivation command.

Aspect 10: The method of aspect 8, wherein the one or more pathlossreference signals include the set of pathloss reference signalsindicated in the configuration or a subset of the set of pathlossreference signals indicated in the configuration.

Aspect 11: The method of any one of aspects 1-7, wherein the one or morepathloss reference signals are identified based at least in part on adetermination that the configuration has been received and based atleast in part on a determination that the pathloss reference signalactivation command has not been received.

Aspect 12: The method of aspect 11, wherein the one or more pathlossreference signals include a synchronization signal block used to obtaina master information block.

Aspect 13: The method of aspect 11, wherein the one or more pathlossreference signals include a subset of the set of pathloss referencesignals.

Aspect 14: The method of aspect 13, wherein the subset is identifiedbased at least in part on a rule.

Aspect 15: The method of any one of aspects 13-14, wherein the subsetincludes a specific number of pathloss reference signals.

Aspect 16: The method of any one of aspects 13-15, wherein the subsetincludes one of: a subset of pathloss reference signals, included in theset of pathloss reference signals, having highest reference signalidentifiers among the set of pathloss reference signals; a subset ofpathloss reference signals, included in the set of pathloss referencesignals, having lowest reference signal identifiers among the set ofpathloss reference signals; a subset of pathloss reference signals,included in the set of pathloss reference signals, having highestreference signal identifiers, in a serving cell, among the set ofpathloss reference signals; a subset of pathloss reference signals,included in the set of pathloss reference signals, having lowestreference signal identifiers, in the serving cell, among the set ofpathloss reference signals; a subset of pathloss reference signals,included in the set of pathloss reference signals, having highestreference signal identifiers, in an active bandwidth part of the servingcell, among the set of pathloss reference signals; or a subset ofpathloss reference signals, included in the set of pathloss referencesignals, having lowest reference signal identifiers, in an activebandwidth part of the serving cell, among the set of pathloss referencesignals.

Aspect 17: The method of aspect 11, wherein the one or more pathlossreference signals are indicated by a base station or are specified by awireless communication standard.

Aspect 18: The method of aspect 17, wherein the one or more pathlossreference signals are not included in the set of pathloss referencesignals.

Aspect 19: The method of aspect 11, wherein the one or more pathlossreference signals include a subset of pathloss reference signals, of theset of pathloss reference signals, that is indicated in theconfiguration.

Aspect 20: The method of aspect 19, wherein the subset of pathlossreference signals includes at least one of: a pathloss reference signalindicated in association with a physical uplink shared channel powercontrol configuration, a pathloss reference signal indicated inassociation with an activated physical uplink control channel spatialrelation, a pathloss reference signal indicated in association with asounding reference signal resource set, or a combination thereof.

Aspect 21: The method of any one of aspects 19-20, wherein a number ofpathloss reference signals, included in the subset of pathloss referencesignals, is less than or equal to a threshold.

Aspect 22: The method of any one of aspects 1-7, wherein the one or morepathloss reference signals are identified based at least in part on adetermination that the configuration has not been received and based atleast in part on a determination that the pathloss reference signalactivation command has not been received.

Aspect 23: The method of aspect 22, wherein the one or more pathlossreference signals include a synchronization signal block used to obtaina master information block.

Aspect 24: The method of aspect 22, wherein the one or more pathlossreference signals are indicated by a base station or are specified by awireless communication standard.

Aspect 25: The method of any one of the preceding aspects, wherein theone or more pathloss reference signals are identified for a particularuplink channel or a particular uplink reference signal.

Aspect 26: The method of any one of the preceding aspects, whereindifferent uplink channels or different uplink reference signals areassociated with at least one of: different configurations that indicatecorresponding sets of pathloss reference signals for a correspondinguplink channel or uplink reference signal, different pathloss referencesignal activation commands, or a combination thereof.

Aspect 27: The method of any one of the preceding aspects, wherein theconfiguration and the pathloss reference signal activation command arespecific to an uplink channel, an uplink reference signal, a group ofuplink channels, a group of uplink reference signals, or a group thatincludes at least one uplink channel and at least one uplink referencesignal.

Aspect 28: The method of any one of the preceding aspects, wherein theone or more pathloss reference signals are identified for all uplinkchannels and all uplink reference signals.

Aspect 29: The method of any one of the preceding aspects, wherein anumber of pathloss reference signals, included in the set of pathlossreference signals, is based at least in part on whether pathlossreference signal activation commands are enabled or disabled.

Aspect 30: The method of aspect 29, wherein the number of pathlossreference signals is permitted to be greater than a threshold ifpathloss reference signal activation commands are enabled, and is notpermitted to be greater than the threshold if pathloss reference signalactivation commands are disabled.

Aspect 31: The method of any one of the preceding aspects, wherein theconfiguration is included in a radio resource control message.

Aspect 32: The method of any one of the preceding aspects, wherein thepathloss reference signal activation command is a medium access control(MAC) control element (CE) message.

Aspect 33: The method of any one of the preceding aspects, wherein theset of pathloss reference signals includes at least one channel stateinformation reference signal.

Aspect 34: The method of any one of the preceding aspects wherein theone or more pathloss reference signals comprise one or more defaultpathloss reference signals.

Aspect 35: A method of wireless communication performed by a userequipment (UE), comprising: identifying one or more pathloss referencesignals based at least in part on a configuration that indicates a setof pathloss reference signals, wherein a number of pathloss referencesignals, included in the set of pathloss reference signals, is based atleast in part on whether pathloss reference signal activation commandsare enabled or disabled; and estimating pathloss using the one or morepathloss reference signals.

Aspect 36: The method of aspect 34, wherein the number of pathlossreference signals is permitted to be greater than a threshold ifpathloss reference signal activation commands are enabled, and is notpermitted to be greater than the threshold if pathloss reference signalactivation commands are disabled.

Aspect 37: An apparatus for wireless communication at a device,comprising a processor; memory coupled with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to perform the method of one or more aspects ofaspects 1-34.

Aspect 38: A device for wireless communication, comprising a memory andone or more processors coupled to the memory, the memory and the one ormore processors configured to perform the method of one or more aspectsof aspects 1-34.

Aspect 39: An apparatus for wireless communication, comprising at leastone means for performing the method of one or more aspects of aspects1-34.

Aspect 40: A non-transitory computer-readable medium storing code forwireless communication, the code comprising instructions executable by aprocessor to perform the method of one or more aspects of aspects 1-34.

Aspect 41: A non-transitory computer-readable medium storing a set ofinstructions for wireless communication, the set of instructionscomprising one or more instructions that, when executed by one or moreprocessors of a device, cause the device to perform the method of one ormore aspects of aspects 1-34.

Aspect 42: An apparatus for wireless communication at a device,comprising a processor; memory coupled with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to perform the method of one or more aspects ofaspects 35-36.

Aspect 43: A device for wireless communication, comprising a memory andone or more processors coupled to the memory, the memory and the one ormore processors configured to perform the method of one or more aspectsof aspects 35-36.

Aspect 44: An apparatus for wireless communication, comprising at leastone means for performing the method of one or more aspects of aspects35-36.

Aspect 45: A non-transitory computer-readable medium storing code forwireless communication, the code comprising instructions executable by aprocessor to perform the method of one or more aspects of aspects 35-36.

Aspect 46: A non-transitory computer-readable medium storing a set ofinstructions for wireless communication, the set of instructionscomprising one or more instructions that, when executed by one or moreprocessors of a device, cause the device to perform the method of one ormore aspects of aspects 35-36.

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the aspects to the preciseform disclosed. Modifications and variations may be made in light of theabove disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware, firmware, and/or a combination of hardware and software. Asused herein, a processor is implemented in hardware, firmware, and/or acombination of hardware and software.

As used herein, satisfying a threshold may, depending on the context,refer to a value being greater than the threshold, greater than or equalto the threshold, less than the threshold, less than or equal to thethreshold, equal to the threshold, not equal to the threshold, and/orthe like.

It will be apparent that systems and/or methods described herein may beimplemented in different forms of hardware, firmware, and/or acombination of hardware and software. The actual specialized controlhardware or software code used to implement these systems and/or methodsis not limiting of the aspects. Thus, the operation and behavior of thesystems and/or methods were described herein without reference tospecific software code—it being understood that software and hardwarecan be designed to implement the systems and/or methods based, at leastin part, on the description herein.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of various aspects. In fact, many ofthese features may be combined in ways not specifically recited in theclaims and/or disclosed in the specification. Although each dependentclaim listed below may directly depend on only one claim, the disclosureof various aspects includes each dependent claim in combination withevery other claim in the claim set. A phrase referring to “at least oneof” a list of items refers to any combination of those items, includingsingle members. As an example, “at least one of: a, b, or c” is intendedto cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combinationwith multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c,a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering ofa, b, and c).

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems, and may be used interchangeably with “one or more.” Furthermore,as used herein, the terms “set” and “group” are intended to include oneor more items (e.g., related items, unrelated items, a combination ofrelated and unrelated items, and/or the like), and may be usedinterchangeably with “one or more.” Where only one item is intended, thephrase “only one” or similar language is used. Also, as used herein, theterms “has,” “have,” “having,” and/or the like are intended to beopen-ended terms. Further, the phrase “based on” is intended to mean“based, at least in part, on” unless explicitly stated otherwise.

What is claimed is:
 1. A method of wireless communication performed by auser equipment (UE), comprising: identifying one or more pathlossreference signals based at least in part on whether a configuration,that indicates a set of pathloss reference signals, has been receivedand based at least in part on whether a pathloss reference signalactivation command has been received; and estimating pathloss using theone or more pathloss reference signals.
 2. The method of claim 1,wherein the one or more pathloss reference signals are identified basedat least in part on a determination that the configuration has not beenreceived and based at least in part on a determination that the pathlossreference signal activation command has not been received.
 3. The methodof claim 2, wherein the one or more pathloss reference signals include asynchronization signal block used to obtain a master information block.4. The method of claim 1, wherein the one or more pathloss referencesignals are identified for a particular uplink channel or a particularuplink reference signal.
 5. The method of claim 1, wherein the pathlossreference signal activation command is a medium access control (MAC)control element (CE) message.
 6. The method of claim 1, wherein the setof pathloss reference signals includes at least one channel stateinformation reference signal.
 7. The method of claim 1, wherein a numberof pathloss reference signals, included in the set of pathloss referencesignals, is based at least in part on whether pathloss reference signalactivation commands are enabled or disabled.
 8. The method of claim 7,wherein the number of pathloss reference signals is permitted to begreater than a threshold if pathloss reference signal activationcommands are enabled, and is not permitted to be greater than thethreshold if pathloss reference signal activation commands are disabled.9. The method of claim 1, wherein the one or more pathloss referencesignals comprise one or more default pathloss reference signals.
 10. Themethod of claim 1, wherein the one or more pathloss reference signalsare identified based at least in part on at least one of: whetherpathloss reference signal activation commands are enabled, a number ofconfigured pathloss reference signals, whether the number of configuredpathloss reference signals satisfies a threshold, or a combinationthereof.
 11. The method of claim 1, wherein the one or more pathlossreference signals are identified based at least in part on adetermination that the configuration has been received and based atleast in part on a determination that the pathloss reference signalactivation command has been received.
 12. The method of claim 1, whereinthe one or more pathloss reference signals are identified based at leastin part on a determination that the configuration has been received andbased at least in part on a determination that the pathloss referencesignal activation command has not been received.
 13. The method of claim1, wherein the configuration and the pathloss reference signalactivation command are specific to an uplink channel, an uplinkreference signal, a group of uplink channels, a group of uplinkreference signals, or a group that includes at least one uplink channeland at least one uplink reference signal.
 14. A method of wirelesscommunication performed by a user equipment (UE), comprising:identifying one or more pathloss reference signals based at least inpart on a configuration that indicates a set of pathloss referencesignals, wherein a number of pathloss reference signals, included in theset of pathloss reference signals, is based at least in part on whetherpathloss reference signal activation commands are enabled or disabled;and estimating pathloss using the one or more pathloss referencesignals.
 15. The method of claim 14, wherein the number of pathlossreference signals is permitted to be greater than a threshold ifpathloss reference signal activation commands are enabled, and is notpermitted to be greater than the threshold if pathloss reference signalactivation commands are disabled.
 16. A user equipment (UE) for wirelesscommunication, comprising: a memory; and one or more processorsoperatively coupled to the memory, the memory and the one or moreprocessors configured to: identify one or more pathloss referencesignals based at least in part on whether a configuration, thatindicates a set of pathloss reference signals, has been received andbased at least in part on whether a pathloss reference signal activationcommand has been received; and estimate pathloss using the one or morepathloss reference signals.
 17. The UE of claim 16, wherein the one ormore pathloss reference signals are identified based at least in part ona determination that the configuration has not been received and basedat least in part on a determination that the pathloss reference signalactivation command has not been received.
 18. The UE of claim 17,wherein the one or more pathloss reference signals include asynchronization signal block used to obtain a master information block.19. The UE of claim 16, wherein the one or more pathloss referencesignals are identified for a particular uplink channel or a particularuplink reference signal.
 20. The UE of claim 16, wherein the pathlossreference signal activation command is a medium access control (MAC)control element (CE) message.
 21. The UE of claim 16, wherein the set ofpathloss reference signals includes at least one channel stateinformation reference signal.
 22. The UE of claim 16, wherein a numberof pathloss reference signals, included in the set of pathloss referencesignals, is based at least in part on whether pathloss reference signalactivation commands are enabled or disabled.
 23. The UE of claim 22,wherein the number of pathloss reference signals is permitted to begreater than a threshold if pathloss reference signal activationcommands are enabled, and is not permitted to be greater than thethreshold if pathloss reference signal activation commands are disabled.24. The UE of claim 16, wherein the one or more pathloss referencesignals comprise one or more default pathloss reference signals.
 25. TheUE of claim 16, wherein the one or more pathloss reference signals areidentified based at least in part on at least one of: whether pathlossreference signal activation commands are enabled, a number of configuredpathloss reference signals, whether the number of configured pathlossreference signals satisfies a threshold, or a combination thereof. 26.The UE of claim 16, wherein the one or more pathloss reference signalsare identified based at least in part on a determination that theconfiguration has been received and based at least in part on adetermination that the pathloss reference signal activation command hasbeen received.
 27. The UE of claim 16, wherein the one or more pathlossreference signals are identified based at least in part on adetermination that the configuration has been received and based atleast in part on a determination that the pathloss reference signalactivation command has not been received.
 28. The UE of claim 16,wherein the configuration and the pathloss reference signal activationcommand are specific to an uplink channel, an uplink reference signal, agroup of uplink channels, a group of uplink reference signals, or agroup that includes at least one uplink channel and at least one uplinkreference signal.
 29. A user equipment (UE) for wireless communication,comprising: a memory; and one or more processors operatively coupled tothe memory, the memory and the one or more processors configured to:identify one or more pathloss reference signals based at least in parton a configuration that indicates a set of pathloss reference signals,wherein a number of pathloss reference signals, included in the set ofpathloss reference signals, is based at least in part on whetherpathloss reference signal activation commands are enabled or disabled;and estimate pathloss using the one or more pathloss reference signals.30. The UE of claim 29, wherein the number of pathloss reference signalsis permitted to be greater than a threshold if pathloss reference signalactivation commands are enabled, and is not permitted to be greater thanthe threshold if pathloss reference signal activation commands aredisabled.